Power bank made at home with 20800 mAh, phone charger, fast charger, and how to make a power bank

You need : old laptop battery, 12 v or 24 v to 5v converter, 3.6 v charging circuit, switch, couple of wires, femail jack for charging the battery and plastic box.

where to find : you can get the plastic box at you home,
battery from old laptop battery or on the shop where the laptops are being repaired you can buy a scrap or damage battery from the seller,
12 -5 v converter can be found on the port of charging circuit in the car.
battery charging circuit can be found online.
femail jack, wires & switch on electronic stores.

Tools in use : soldering iron, hot glue gun, etc..

Step 1 : take the old laptop battery and remove the 3.6 v cell from the battery carefully.

Step 2 : de solder the 3.6 v cells from the circuit and test according as shone in the video.

Step 3 : take the charging circuit used in the car it would be 12 v or 24 v remove the circuit and connect to the battery in between the switch.

Step 4 : take the charging circuit of cell and connect to the battery.

Step 5 : connect the female jack to other end of the circuit.